Read the text about a natural disaster and choose the correct answer for each question.

Adapted from BBC

Lightning is both spectacular and really dangerous. About 2,000 people are killed worldwide by it each year. Hundreds more survive strikes but suffer from a variety of symptoms, including memory loss, dizziness, weakness and many others. Strikes can cause cardiac arrest and severe burns, but 9 of every 10 people can survive. The average American has about a 1 in 5,000 chance of being struck by lightning during a lifetime.

Lightning is an electrical discharge caused by imbalances between storm clouds and the ground. Often lightning occurs within the clouds.

During a storm, colliding particles of rain, ice, or snow inside storm clouds increase the imbalance between storm clouds and the ground, and often negatively charge the lower reaches of storm clouds. Objects on the ground, like trees, and the Earth itself, become positively charged. It creates an imbalance that nature wants to change by passing current between them.

Lightning is extremely hot. This flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand.

Lightning bolts are a common phenomenon. Each bolt can contain up to one billion volts of electricity.

Some types of lightning, including the most common types, never leave the clouds but travel between differently charged areas within or between clouds. Other rare forms can be sparked by extreme forest fires, volcanic eruptions, and snowstorms. Ball lightning, a small, charged sphere that floats, still puzzles scientists.

1. What health problems are caused by lightning bolts?
   A. high temperature, cold, running nose
   B. stomachache, cough, cuts
   C. dizziness, memory problems, weakness
   
2. How many people die because of a stroke of lightening?
   A. about a thousand
   B. less than a thousand
   C. more than a thousand
   
3. How do scientists describe lightning?
   A. cold floating air in the clouds
   B. natural phenomenon formed between two differently charged regions
   C. the flow of rain, ice and snow particles
   
4. What is the reason of the imbalance between clouds and the ground?
   A. Hot air
   B. Particles of rain, ice and snow
   C. Air pressure
   
5. In what way does lightning change the air?
   A. It makes it electrified.
   B. It makes it wet.
   C. It makes it hot.

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